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Here is the most recent audio interview with Richard Stallman. In it he introduces the basics of the Free Software philosophy, but in a further discussion also explains some other interesting things such as the fact that Free Software is actually more in accord with the free market capitalism than proprietary software, the reduction of freedom that is going on in the world (specifically mentioned US and UK) and also Stallmans motivations for advocating freedom.

A different free operating system, which was far ahead of its time. The architecture is both pragmatic and elegant (three different small but monolithic kernels for "terminals", "cpu servers" and "file servers", and most things including filesystems running in user space).

It's presumed dead by many, but there still are active developers. If GNU/Linux isn't geeky enough for you anymore, try this. If you want to make efficient use of multiple networked computers, also try this.